📝 Update comma in docs/en/docs/async.md (#12062)

Co-authored-by: Alec Gillis <alecgillis@quorum.us>
Co-authored-by: Sofie Van Landeghem <svlandeg@users.noreply.github.com>

docs/en/docs/async.md

@@ -387,7 +387,7 @@ In previous versions of NodeJS / Browser JavaScript, you would have used "callba
 
 ## Coroutines
 
-**Coroutine** is just the very fancy term for the thing returned by an `async def` function. Python knows that it is something like a function that it can start and that it will end at some point, but that it might be paused ⏸ internally too, whenever there is an `await` inside of it.
+**Coroutine** is just the very fancy term for the thing returned by an `async def` function. Python knows that it is something like a function, that it can start and that it will end at some point, but that it might be paused ⏸ internally too, whenever there is an `await` inside of it.
 
 But all this functionality of using asynchronous code with `async` and `await` is many times summarized as using "coroutines". It is comparable to the main key feature of Go, the "Goroutines".